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(11) | EP 2 045 573 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Phase-information extraction method |
| (57) Only phase information of a measurement object is extracted with superior precision
from a phase-information image in which background phase information is superimposed
on phase information of the measurement object. A method of extracting phase information
of a measurement object includes a region-specifying step of specifying a region in
which a measurement object exists and a region in which no measurement object exists
in a phase-information image containing measurement objects, showing a two-dimensional
distribution of phase information to be measured, a background-image creating step
of creating a background phase-information image by interpolating the phase information
of the region in which the measurement object exists on the basis of the phase information
of the region in which no measurement object exists, specified in the region-specifying
step; and a difference calculating step of calculating a difference between the background
phase-information image created in the background-image creating step and the phase-information
image.
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